Bump org.apache.zookeeper:zookeeper from 3.5.5 to 3.7.2

Bumps org.apache.zookeeper:zookeeper from 3.5.5 to 3.7.2.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -75,7 +75,7 @@
 
     <properties>
         <grizzly-framework-version>2.4.4</grizzly-framework-version>
-        <zookeeper-version>3.5.5</zookeeper-version>
+        <zookeeper-version>3.7.2</zookeeper-version>
         <jdk.compile.version>1.8</jdk.compile.version>
         <maven.compiler.argument>
             -Xlint:unchecked,deprecation,fallthrough,finally,cast,dep-ann,empty,overrides